<template>
    <div>
        <!-- 面包屑导航 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>权限管理</el-breadcrumb-item>
        <el-breadcrumb-item>角色列表</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图 -->
        <el-card>
            <el-table :data="rolesList" border stripe>
                <!-- 展开列 -->
                <el-table-column type="expand">
                    <template slot-scope="scope">
                        <el-row :class="['bdtop bdbottom']" v-for="item1 in scope.row.children" :key="item1.id">
                            <!-- 渲染一级权限 -->
                            <el-col :span='5'>
                                <el-tag closable @close="removeRightById(scope.row,item1.id)">{{item1.authName}}</el-tag>
                                <i class="el-icon-caret-right"></i><!-- 箭头小图标 -->
                            </el-col>
                            <!-- 渲染二级、三级权限 -->
                            <el-col :span='19'>
                                <!-- 通过for循环，嵌套渲染二级权限 -->
                                <el-row :class="['bdbottom']" v-for="item2 in item1.children" :key="item2.id">
                                    <!-- 渲染二级权限 -->
                                    <el-col :span='5'>
                                        <el-tag type="success" closable @close="removeRightById(scope.row,item2.id)">{{item2.authName}}</el-tag>
                                        <i class="el-icon-caret-right"></i><!-- 箭头小图标 -->
                                    </el-col>
                                    <!-- 渲染三级权限 -->
                                    <el-col :span='19'>
                                        <el-tag :class="['bdbottom']" type="warning" closable
                                            v-for="item3 in item2.children" :key="item3.id"
                                            @close="removeRightById(scope.row,item3.id)">
                                            {{item3.authName}}
                                        </el-tag>
                                    </el-col>
                                </el-row>
                            </el-col>
                        </el-row>
                    </template>
                </el-table-column>
                <el-table-column type="index"></el-table-column>
                <el-table-column label="角色名称" prop="roleName"></el-table-column>
                <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
                <el-table-column label="操作" width="300px">
                   <template slot-scope="scope">
                        <el-button size= "mini" type="primary" icon="el-icon-edit">编辑</el-button>
                        <el-button size= "mini" type="danger" icon="el-icon-delete">删除</el-button>
                        <el-button size= "mini" type="warning" icon="el-icon-setting" @click="showSetRightDialog(scope.row)">
                            分配权限
                        </el-button>
                    </template>
                </el-table-column>
            </el-table>
        </el-card>
        <el-dialog title="分配权限" :visible.sync="setRightDialogVisible" width="50%">
            <!-- 树形组件 -->
            <el-tree :data="rightsList" :props="treeProps" show-checkbox default-expand-all 
            node-key="id" :default-checked-keys="defkeys" ref="treeRef"></el-tree>
            <span slot="footer" class="dialog-footer">
                <el-button @click="setRightDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="allotRights()">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
export default { 
    data(){
        return {
            //角色列表
            rolesList: [],
            //控制分配权限对话框的显示与隐藏
            setRightDialogVisible: false,
            //所有权限的数据
            rightsList: [],
            //树形控件的属性绑定对象
            treeProps: {
                label: 'authName',
                children: 'children'
            },
            //默认选中的权限ID数组对象
            defkeys: [],
            //当前即将分配权限的角色ID
            roleId: ''
        }
    },
    created(){
        //获取所有的角色信息
        this.getRolesList();
    },
    methods:{
        //获取角色列表
        async getRolesList(){
            const {data:res} = await this.$http.get('roles');
            if(res.meta.status!==200){
                return this.$message,error("获取角色列表失败！");
            }
            this.rolesList = res.data;
        },
        //根据ID删除对应的权限
        removeRightById(role,rightId){
            //弹框提示用户是否需要删除
            this.$confirm('是否删除该权限?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).then(async () => {
                //调用删除API进行权限删除
                const {data: res} = await this.$http.delete('roles/'+role.id+'/rights/'+rightId);
                if(res.meta.status!==200){
                    return this.$message.error('删除权限失败！');
                }
                this.$message({type: 'success',message: '删除权限成功!'});
                //获取服务器返回的当前角色的最新权限数据，然后赋值给原来的角色对象
                role.children = res.data;
            }).catch(() => {
                this.$message({type: 'info',message: '已取消删除' });          
            });
        },
        //展示权限分配的对话框
        async showSetRightDialog(role){
            this.roleId = role.id;
            //获取所有权限的数据
            const {data: res} = await this.$http.get('rights/tree');
            if(res.meta.status!==200){
                return this.$message.error('获取权限数据失败！');
            }
            //把获取到的权限数据保存到data中
            this.rightsList = res.data;
            //递归获取三级节点的ID
            this.defkeys = [];//清空数组
            this.getLeafKeys(role,this.defkeys);
            //显示对话框
            this.setRightDialogVisible = true;
        },
        //获取角色下的三级权限ID(通过递归)，保存到defkeys数组
        getLeafKeys(node,arr){
            //如果当前node节点不包含children属性，则是三级节点
            if(!node.children){
                return arr.push(node.id);
            }
            node.children.forEach(item => this.getLeafKeys(item,arr));
        },
        //点击为角色分配权限
        async allotRights(){
            //"..."为“展开运算符”，将一个数组转为用逗号分隔的参数序列
            const keys = [
                ...this.$refs.treeRef.getCheckedKeys(),
                ...this.$refs.treeRef.getHalfCheckedKeys()
            ]
            const idStr = keys.join(",");
            const {data: res} = await this.$http.post('roles/'+this.roleId+'/rights',{rids:idStr});
            if(res.meta.status!==200){
                return this.$message.error('分配权限失败！');
            }
            this.$message.success('分配权限成功！');
            //重新刷新角色列表
            this.getRolesList();
            //关闭对话框
            this.setRightDialogVisible = false;
        }
    }
}
</script>

<style scoped>
.el-tag {
  margin: 7px;
}
.bdtop{
  border-top: 1px solid #eee;
}
.bdbottom{
  border-bottom: 1px solid #eee;
}
.vcenter{
    display: flex;
    align-items: center;
}
</style>